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# On a photograph of a triangular piece of land, help

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On a photograph of a triangular piece of land, the lengths of the three sides are 3 cm, 7 cm, and 8 cm, respectively. The shortest side of the actual piece of land is 120m long. Find the lengths of the other two sides.

The length of the longest side of the triangular piece of land is _____▼m.m2. c .cm2. m.

The length of the  middle-sized side of the triangular piece of land is  ____ cm  .cm2. m2 .

@CPhill

Dec 5, 2017

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We know that

the shortest side on the photo * the scale factor  =  the shortest side on land

3 * s  =  120

s  =  120/3  =  40

So each side on land is  40  times the corresponding side in the photo.

the longest side  =  40 * 8  =  320  m

the middle side   =  40 * 7  =  280  m

Dec 5, 2017

#1
+7354
+2

We know that

the shortest side on the photo * the scale factor  =  the shortest side on land

3 * s  =  120

s  =  120/3  =  40

So each side on land is  40  times the corresponding side in the photo.

the longest side  =  40 * 8  =  320  m

the middle side   =  40 * 7  =  280  m

hectictar Dec 5, 2017